How to Change the Coolant in a 2026 Sherco 250 SEF FACTORY: Step-by-Step Guide

Shop parts for a 2026 Sherco 250 SEF FACTORY Dirt Bike.

The 2026 Sherco 250 SEF FACTORY is a high-performance 4-stroke enduro bike renowned for its upgraded frame, revised air box, and lightweight engineering. Maintaining optimal engine temperature is essential for peak performance on and off-road. Follow this MotoSport-exclusive guide to perform a coolant change correctly and protect your investment.

What Makes the 2026 Model Unique?

  • Lighter, redesigned frame for better handling and easier maintenance access
  • Updated airbox design with enhanced sealing and more direct panel access
  • Innovative engine mount system for improved chassis flex feedback
  • High-quality KYB suspension with Factory model spec
  • Factory-specific engine tuning for higher revving performance

Tools & Supplies Needed

  • Compatible engine coolantnever use plain water or unapproved fluids as this can damage your engine
  • Phillips and flathead screwdrivers
  • 3/8 inch ratchet and socket set (10 mm recommended for water pump housing bolts)
  • Drain pan
  • Funnel
  • Clean cloths
  • Rubber gloves (optional, for cleanup)

Step 1: Preparation

  • Make sure the engine is cool to avoid burns.
  • Place the bike on a stable stand and remove the skid plate if it blocks access to the water pump area.
  • Remove the front and side plastics if easier coolant fill and drain port access is needed.

Step 2: Drain the Old Coolant

  • Locate the coolant drain bolt. On the Sherco 250 SEF FACTORY, this is typically on the lower right side engine case marking the bottom of the water pump cover.
  • Place the drain pan beneath the bolt. Remove the radiator cap to prevent vacuum and allow coolant to flow freely.
  • Carefully remove the drain bolt and allow all coolant to drain completely. Tilt the bike side-to-side gently to ensure all old coolant is removed.
  • If desired, remove the water pump cover to inspect for residue or corrosion. Clean as needed.

Step 3: Reinstall Drain Bolt & Cover

  • Inspect the drain bolt and sealing washer for wear–replace if damaged.
  • Reinstall and tighten the drain bolt to manufacturer spec.
  • Reinstall the water pump cover securely if removed.

Step 4: Fill with Fresh Coolant

  • Using a funnel, slowly pour the approved coolant into the radiator filler neck. Fill until coolant reaches the bottom of the filler neck.
  • Gently rock the bike and squeeze radiator hoses to release air bubbles.

Step 5: Bleed the Cooling System

  • Some air will get trapped–start the engine with the radiator cap off and let it idle for 2–3 minutes.
  • Rev lightly a few times to help purge remaining air. Watch coolant level and top off as air escapes.
  • Once level stabilizes, shut off the engine and reinstall the radiator cap.

Step 6: Final Checks

  • Inspect for leaks at the drain bolt, hoses, and water pump cover.
  • Double check coolant level after first ride and top off if needed.
  • Dispose of old coolant responsibly according to local regulations.

Special Notes for 2026 Sherco 250 SEF FACTORY Owners

  • Only use manufacturer-approved coolantfailure to do so can cause significant engine or radiator damage.
  • Due to high-end cooling system components, always inspect for leaks or damage during coolant changes. The 2026 model has improved sealing but is still sensitive to improper coolant choice.
  • The upgraded frame and airbox design may make draining and filling easier, but careful removal and reinstallation of plastics is recommended to avoid breaking new mounting tabs or clips.

Routine coolant changes are crucial for reliable performance and longevity, especially given the advanced engine tuning and thermal management on the Sherco 250 SEF FACTORY. For parts, fluids, and upgrades specific to your machine, visit MotoSport–we support your ride every mile.

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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.